Retinoscope



R. P. CARPENTER RETINOSCOPE Filed Jan. 5, 1932 i VmToR. F/26429; (T0/)060762.13

A TTORNEYS.

sep@a 19, 1933.

Patentes sept. ie, less nire -i l f 1,927,111

i errice Application January 5, 1932.

3 Claims.

This invention relates to improvements in retinoscopes.

An object of the invention is the construction of a simple and efficient retinoscope that is preferably supported uponva head band or strap, leaving the refractionists hands free.

Another object of the invention is the production of a headsupported retinosoope, which is furnished with eiiicient means for supporting a reflecting mirror, chart, lens and electric bulb socket.

A still further object of the invention is the construction of a simple and eicient device for measuring the refraction of a patients eyes,

comprising a source of light, biconvex lens (made of special glass, which absorbs most of the ultra Violet rays of light), a reflector (through which light reflex in pupil of patients eye may be 0bserved), together with certain other units.

With the foregoing and other objects in View, my invention comprises certain novel constructions, combinations and arrangements of parts as will be hereinafter fully described, illustrated in the accompanying drawing, and more particularly pointed out in the appended claims.

In the drawing:

Figure 1 is a vertical, longitudinal sectional View through a device constructed in accordance with the present invention, while Figure 2 is a front elevation of the same.

Figure 3 is a section taken on line 3-3, Figure l, and looking in the direction of the arrows.

Figure 4 is an enlarged vertical, sectional view of the depending lens tube, lens ring and lens supported by said ring.

Referring to the drawing by numerals, 1 designates the head band or strap that the refractionist can readily place or position upon his head, and to which is suitably secured a plate 2 y provided with an integral socket 3.

The improved device comprises a casing 4 the back of which is preferably a straight plate 5 of the design particularly shown in Fig. 2; this design is admirably adapted to the face of the refractionist on whose head the device is mounted. In the top of casing 4. is a vertical sleeve 6 which sleeve supports the bulb socket 7. This bulb socket has an electric bulb 8, of suitable power, for furnishing the light to the device.

At opposite sides of the casing 4, I form registering, vertical grooves 9; in one set of the grooves 9, I mount a transparent or translucent chart 10 on which are suitable figures or characters to be observed by the patient. The two sets of Serial No. 584,878

grooves 9 are provided, and are open at the top of the casing, so that I may place a glass behind the chart 10, if I so desire, or may place a chart of one color in one set of the grooves and a plate of another color in the other set. The chart or glass can be slid quickly into the grooves from the top of the casing.

To the back of the casing ll, constituted by said long vertical plate 5, I secure a plate 11, which V has an integral ball 12. This ball 12 fits snugly 65 into socket 3, whereby the device is supported upon the head band, and can be turned easily to enable the refractionist to secure an accurate adjustment or focus with respect to the patients eye being examined.

On the bottom of the casing 4, I form a depending lens tube 13. On the lower end of lens tube 13 is removably mounted a lens ring 14. The lens ring 14 is provided with an upper iiange 15 f, (Fig. il) and a lower flange 16. Between these flanges 15 and 16 is secured a lens or combination of two or more lenses 17, (which may comprise a central concave lens 18, against which is an upper convex lens 19, and a lower convex lens 20).

A sight tube 21 extends through plate 5 below 8b the lens, this tube being outwardly flared at 22, and at its outer end extends to the back of the mirror 23 and partly assists in supporting same. The mirror 23 is positioned between two vertical parallel brackets 2li formed on the front of plate g5 5, and each bracket 2e is provided with a right angled flange 25 (Fig. 2) clamping upon the mirror 23 for assisting in holding the same securely against said sight tube 21, and directly beneath the lens 1'7, whereby the light rays are admirably gt) reflected into the pupil of the patients eye, while the refractionist is examining said eye through sight tube 22.

It it to be understood that when three lenses t, 18, 19 and 2i) are used, they act together as a 95 single corrected convex lens, (and that the source of light is to be above the lens and at or near its principal focus).

While I have described the preferred embodiment of my invention and illustrated the same 100 in the accompanying drawing, certain minor changes or alterations may appear to one skilled in the art to which this invention relates, during the extensive manufacture of the same, and I, N.

therefore, reserve the right to make such altera 105 tions or changes as shall fairly fall within the scope of the appended claims.

What I claim is:

1. A retinoscope, comprising a casing includy ing along nat back plate; a bulb socket extending through the top of said casing, a lens carried by the bottom of said casing, a sight tube extending through said back plate beneath said lens and outwardly flared at its inner end within said back plate, and a mirror mounted against the outer end of said sight tube beneath said lens.

2.v A retinoscope, comprising a casing including a long back plate, said Casng provided with a light source and with a depending lens tube, a lens on the lower end of said tube, a sight tube extending through said back plate and provided with an inner ared end, a pair of brackets extending from said back plate with said sight tube therebetween, a mirror positioned against said sight tube beneath said lens and between said RUBEN PAUL CARPENTER. 

